Source : Webster's Revised Unabridged Dictionary (1913)

Glyph \Glyph\, n. (Arch[ae]ol.)
   A carved figure or character, incised or in relief; a carved
   pictograph; hence, a pictograph representing a form
   originally adopted for sculpture, whether carved or painted.

Glyph \Glyph\ (gl[i^]f), n. [Gr. glyfh` carving, fr. gly`fein to
   carve: cf. F. glyphe. Cf. {Cleave} to split.] (Arch.)
   A sunken channel or groove, usually vertical. See {Triglyph}.

Source : WordNet®

glyph
     n : glyptic art in the form of a symbolic figure carved or
         incised in relief

Source : Free On-Line Dictionary of Computing

glyph
     
         An {image} used in the visual representation of
        {characters}; roughly speaking, how a character looks.  A
        {font} is a set of glyphs.
     
        In the simple case, for a given {font} ({typeface} and size),
        each character corresponds to a single glyph but this is not
        always the case, especially in a language with a large
        alphabet where one character may correspond to several glyphs
        or several characters to one glyph (a {character encoding}).
     
        Usually used in reference to {outline fonts}, in particular
        {TrueType}.
     
        (1998-05-31)